Add missing libraries to requirement files

Change-Id: I596d29bcadd409eb78bf1e456201bd5d616a6e84

lower-constraints.txt

@@ -2,8 +2,10 @@ bandit==1.4.0
 coverage==4.0
 doc8==0.6.0
 hacking==0.12.0
+mock==2.0.0
 oslo.i18n==3.15.3
 oslo.log==3.36.0
+oslo.serialization==2.28.1
 oslo.utils==3.33.0
 oslotest==3.2.0
 pbr==2.0.0

requirements.txt

@@ -4,5 +4,6 @@
 
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
+oslo.serialization>=2.28.1 # Apache-2.0
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 six>=1.10.0 # MIT

test-requirements.txt

@@ -7,6 +7,7 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 bandit>=1.1.0 # Apache-2.0
 coverage>=4.0,!=4.4 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
+mock>=2.0.0 # BSD
 pylint==1.9.2 # GPLv2
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslo.utils>=3.33.0 # Apache-2.0

tox.ini

@@ -5,14 +5,17 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+install_command = pip install {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
    OS_STDOUT_CAPTURE=1
    OS_STDERR_CAPTURE=1
    OS_TEST_TIMEOUT=60
-deps = -r{toxinidir}/test-requirements.txt
+deps =
+    -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+    -r{toxinidir}/requirements.txt
+    -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]